> developing the first meaningful fully-reusable first stage rocket, and continuing to develop it to the extent that no other launch systems are even in the same ballpark as regards cost, cadence, or mass to orbit.
The space shuttle solid boosters were reusable, the only part of the space shuttle program that wasn't, was the big orange tank.
https://en.m.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_B...
Eh, I knew someone was going to nit-pick this point, which was why I wrote "first meaningful fully-reusable first stage rocket" but obviously this wasn't enough. :)
I too, was certain there would be a "he said meaningful" follow up. ;)